First and foremost, would be fuses. Check them close and carefully (hairline cracks often go un-noticed at first glance)
Does the aux. fan come one once the engine temp is high enough for it to come one?
Does the compressor come on even momentarily? (at the instant you push the A/C button).
Did the system cool well before it stopped working, or was there some degredation prior?

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It is a truism that almost any sect, cult, or religion will legislate its creed into law if it acquires the political power to do so. Robert A. Heinlein


09 Jetta TDI
1985 300D